2021 Fiscal Year Annual Research Report
Development of two-dimensional strain mapping technique around a fatigue crack using the pulsed neutron Bragg-edge transmission imaging and neutron diffraction
| Project/Area Number |
20K20106
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
蘇 玉華 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 J－PARCセンター, 技術副主幹 (20644264)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | fatigue damage / Bragg-edge imaging / neutron diffraction |
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| Outline of Annual Research Achievements |
Fatigue damage is known as one of the major concerns in maintaining the integrity of large-scale engineering components. The nonlinear strain/stress distribution around a fatigue crack tip has a great impact to understand the fatigue and crack growth behavior of engineering component. This research is devoted to develop the fatigue evaluation technique by a combination of two neutron methods: Bragg-edge transmission imaging and diffraction.Two-dimensional maps of inhomogeneous residual strain and microstructure for the compact-tension samples, which had been under different fatigue loading conditions, were determined by Bragg-edge spectral analysis. The obtained Bragg-edge imaging results were quantitatively compared with those determined by diffraction. Surface strains by digital image correlation during the fatigue tests were also measured.
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